lang: add diagnostic definitions

lang/diag.c

@@ -0,0 +1,26 @@
+#include <ivy/diag.h>
+#include <ivy/lang/diag.h>
+
+#define ERROR_CLASS(id, title)                                                 \
+	[id] = {.c_type = IVY_DIAG_ERROR, .c_title = (title)}
+
+#define MSG(id, content) [id] = {.msg_content = (content)}
+
+static const struct ivy_diag_class diag_classes[] = {
+	ERROR_CLASS(IVY_LANG_E_UNRECOGNISED_SYMBOL, "Unrecognised symbol"),
+};
+static const size_t nr_diag_classes = sizeof diag_classes / sizeof diag_classes[0];
+
+static const struct ivy_diag_msg diag_msg[] = {
+	MSG(IVY_LANG_MSG_UNKNOWN_SYMBOL_ENCOUNTERED,
+            "encountered a symbol that is not part of the Ivy syntax."),
+};
+static const size_t nr_diag_msg = sizeof diag_msg / sizeof diag_msg[0];
+
+enum ivy_status ivy_lang_diag_ctx_init(struct ivy_diag_ctx *ctx)
+{
+	ivy_diag_ctx_set_class_definitions(ctx, diag_classes, nr_diag_msg);
+	ivy_diag_ctx_set_msg_definitions(ctx, diag_msg, nr_diag_msg);
+
+	return IVY_OK;
+}